CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Partnership Merger	Common Stock	Common Stock Partnership Merger	Additional Paid-in Capital	Additional Paid-in Capital Partnership Merger	Accumulated Other Comprehensive Loss	Treasury Stock	Accumulated Deficit	Noncontrolling Interest	Noncontrolling Interest Partnership Merger
Beginning balance at Dec. 31, 2016	$ 684,928		$ 762		$ 3,021,040		$ (1,678)	$ (73,944)	$ (2,227,214)	$ (34,038)
Beginning balance, shares at Dec. 31, 2016			76,162,279					(5,626,074)
Increase (Decrease) in Stockholders' Equity
Treasury stock purchased, shares								(225,237)
Treasury stock purchased	(2,788)							$ (2,788)
Cash dividends	(34,063)								(34,063)
Shares issued in employee stock purchase plan, shares			35,180
Shares issued in employee stock purchase plan	356				356
Stock-based compensation, net of forfeitures, shares			616,799					(79,069)
Stock-based compensation, net of forfeitures	9,009		$ 6		8,115					888
Stock options exercised, shares			66,604
Stock options exercised	992		$ 1		991
Contribution from Exterran Corporation	44,709				44,709
Net proceeds from the sale of Partnership units, net of tax	49,726				17,638					32,088
Cash distribution to noncontrolling unitholders of the Partnership	(44,449)									(44,449)
Shares issued for Elite Acquisition		$ 0
Comprehensive income
Net income	18,410								18,953	(543)
Interest rate swap gain (loss), net of reclassifications to earnings	7,107						2,484			4,623
Amortization of terminated interest rate swaps	359						359
Adjustments from other changes in ownership of Partnership	32						32
Merger-related adjustments	0						0
Ending balance, share at Dec. 31, 2017			76,880,862					(5,930,380)
Ending balance at Dec. 31, 2017	735,618		$ 769		3,093,058		1,197	$ (76,732)	(2,241,243)	(41,431)
Increase (Decrease) in Stockholders' Equity
Treasury stock purchased, shares								(167,382)
Treasury stock purchased	(1,759)							$ (1,759)
Cash dividends	(58,288)								(58,288)
Shares issued in employee stock purchase plan, shares			93,617
Shares issued in employee stock purchase plan	803		$ 1		802
Stock-based compensation, net of forfeitures, shares			960,028					(141,121)
Stock-based compensation, net of forfeitures	7,138		$ 10		7,192					(64)
Stock options exercised, shares			218,997					(142,722)
Stock options exercised	(28)		$ 2		1,341			$ (1,371)
Contribution from Exterran Corporation	18,744				18,744
Cash distribution to noncontrolling unitholders of the Partnership	(11,766)									(11,766)
Merger-related adjustments, shares				57,634,005
Merger-related adjustments		98,322		$ 576		$ 56,845					$ 40,901
Shares issued for Elite Acquisition		57,421
Comprehensive income
Net income	29,160								21,063	8,097
Interest rate swap gain (loss), net of reclassifications to earnings	2,681						(1,582)			4,263
Amortization of terminated interest rate swaps	230						230
Adjustments from other changes in ownership of Partnership	0
Merger-related adjustments	5,670						5,670
Ending balance, share at Dec. 31, 2018			135,787,509					(6,381,605)
Ending balance at Dec. 31, 2018	841,574		$ 1,358		3,177,982		5,773	$ (79,862)	(2,263,677)	0
Increase (Decrease) in Stockholders' Equity
Treasury stock purchased, shares								(212,080)
Treasury stock purchased	(2,007)							$ (2,007)
Cash dividends	(78,530)								(78,530)
Shares issued in employee stock purchase plan, shares			87,933
Shares issued in employee stock purchase plan	771		$ 1		770
Stock-based compensation, net of forfeitures, shares			1,104,793					(108,917)
Stock-based compensation, net of forfeitures	8,105		$ 11		8,094
Shares issued for Elite Acquisition, shares			21,656,683
Shares issued for Elite Acquisition	225,880	$ 0	$ 217		225,663
Comprehensive income
Net income	97,330								97,330
Interest rate swap gain (loss), net of reclassifications to earnings	(7,160)						(7,160)
Amortization of terminated interest rate swaps	0
Adjustments from other changes in ownership of Partnership	0
Merger-related adjustments	0						0
Ending balance, share at Dec. 31, 2019			158,636,918					(6,702,602)
Ending balance at Dec. 31, 2019	$ 1,085,963		$ 1,587		$ 3,412,509		$ (1,387)	$ (81,869)	$ (2,244,877)	$ 0